There will be at least two notable anniversaries at this weekend’s two-day Tribute to the Reggae Legends Festival at downtown’s Broadway Pier. The first is the event itself, which was launched 31 years ago as the Bob Marley Day Festival by Makeda Dread, the founder of Balboa Park’s invaluable World Beat Center.

The first edition was held at North Park’s long-defunct International Blend coffeehouse, followed by a move to the Jackie Robinson YMCA, Golden Hall and the San Diego Sports Arena. This year, the fest will be held at an outdoor venue that should provide a panoramic backdrop for two nights of what Marley saluted in song as roots rock reggae.

Performing Saturday will be San Diego’s Big Mountain, which this year celebrates its 20th anniversary and is the only reggae band from California to have headlined Jamaica’s Reggae Sunsplash festival. Big Mountain’s lead singer, Joaquin “Quino” McWhinney, met Dread in the 1980s when he worked at her vegetarian restaurant, The Prophet.

Big Mountain has been recording with producer Jed Leiber, which has yielded one promising song, “Leap of Faith.” The producer will join Big Mountain on Saturday to perform a reggae version of “Stand by Me,” the Ben E. King classic co-written by Leiber’s father, Jerry. With any luck, the new chapter for both the festival and Big Mountain will yield musical fruit for years.

From Frank Sinatra to Kiss, more than a few pop and rock stars have mounted much-publicized farewell tours, only to subsequently “un-retire” and tour again (and again). But when Glen Campbell announced his farewell tour last year, there was — sadly — no reason to doubt him.

Now 75, the legendary troubadour was diagnosed last year with Alzheimer’s disease. With his memory fading as his mental confusion increases, he isn’t embarking on a farewell tour as a crass moneymaking vehicle. “The Glen Campbell Goodbye Tour,” which stops Friday night at Pala Casino’s 21-and-up Infinity Lounge, is an opportunity for him to connect with his fans, and his decades-long musical legacy, in a concert setting one last time. His declining health dictates his retirement, much as he and his devoted followers wish otherwise.

Campbell’s condition lends added poignancy to the title of his 2011 album, “Ghost on the Canvas,” which was released by Encinitas-based Surfdog Records. The 16-song album’s final selection, “There’s No Me … Without You,” was co-written by Campbell. It serves as a suitable epitaph for this multifaceted legend, who on Saturday received a Lifetime Achievement Award Grammy and on Sunday performed on the Grammy Awards telecast with Blake Shelton and The Band Perry.

Shelton and The Band Perry may owe a bigger debt than they realize to Campbell’s pioneering brand of country-pop. Yet, even if he had never scored such classics as “Galveston,” “Wichita Lineman,” “Southern Nights” and “By the Time I Get to Phoenix,” Campbell’s place in music history would be ensured.

A superb guitarist in his pre-Alzheimer’s days, he could hold his own in any setting (I still recall him jamming years ago with George Benson, on a live network TV show, and cutting Benson to shreds). As a studio guitarist and background singer in Los Angeles, Campbell performed on nearly 600 record dates in 1963 alone. His array of credits includes work with Sinatra (“Strangers in the Night”), Elvis Presley (“Viva Las Vegas”), the Righteous Brothers (“You’ve Lost That Lovin’ Feelin”), the Beach Boys (“Good Vibrations”) and many more.

I don’t expect him to sing or play at Pala with the masterful verve of his heyday. But I do expect there won’t be a dry eye in the house, or onstage, as this graying road dog bids his fans here a final farewell.